use hash table to find actor acquaintances

Link: https://github.com/GeneAssembly/biosal/issues/200
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
input controller must receive its customers

     18 7143424/7143424
      1 7143468/7143468
     77 7151616/7151616

Link: https://github.com/GeneAssembly/biosal/issues/199
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>